1.

Fill in the blanks. (a) Oxygen ………… burn, but ………… burning. (b) Some ………… substances absorb ………… from the air. (c) It is mandatory to treat ………… before letting them out. (d) Solid carbon dioxide is also called ………… .

Answer»

Fill in the blanks.



(a) Oxygen ………… burn, but ………… burning.



(b) Some ………… substances absorb ………… from the air.



(c) It is mandatory to treat ………… before letting them out.



(d) Solid carbon dioxide is also called ………… .





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